   understanding the concept of a matrix stack. The push-matrix
   function saves the current coordinate system to the stack and
   pop-matrix restores the prior coordinate system. push-matrix and
-  pop-matrix are used in conjuction with the other transformation
+  pop-matrix are used in conjunction with the other transformation
   methods and may be embedded to control the scope of the
   transformations."
   []

    :added "1.0"}
  save-frame
  "Saves an image identical to the current display window as a
  file. May be called multple times - each file saved will have a
  unique name. Name and image formate may be modified by passing a
  string parameter of the form \"foo-####.ext\" where foo- can be any
  arbitrary string, #### will be replaced with the current frame id
  and .ext is one of .tiff, .targa, .png, .jpeg or .jpg

     light-specular
     "Sets the specular color for lights. Like fill, it affects only the
  elements which are created after it in the code. Specular refers to
  light which bounces off a surface in a preferred direction (rather
  than bouncing in all directions like a diffuse light) and is used
  for creating highlights. The specular quality of a light interacts
  with the specular material qualities set through the specular and
